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Introduction to mainstream technology of noise treatment of rubber lining plate of ball mill

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  • Release time：2022-03-10
  • Publishing staff：admin
  • Number of visitors：1616
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Detailed introduction
Based on the analysis of noise generation mode and noise form of rubber lining plate of ball mill, the noise of rubber lining plate of ball mill is treated. The design adopts cylinder sound insulation sleeve, adding GT-I vibration and noise reduction material inside the cylinder to control the noise of the rubber liner of 5.58.5 overflow type ball mill, which can get better results. At the same time, it has certain positive significance for the promotion of noise control technology of rubber lining plate of ball mill. As one of the four major environmental hazards, noise has attracted more and more attention. Rubber lining plate of ball mill is widely used equipment in mining, chemical industry, building materials and other fields, which is composed of motor, reducer and rotary cylinder.
When the rubber liner of the ball mill is working, the material in the cylinder falls and impacts the liner, causing vibration of the cylinder, causing noise, and the noise of the rubber liner of the ball mill can reach more than 115dB, seriously exceeding the 90dB requirement allowed by the state. At the same time, vibration will also affect the life and working state of the rubber liner of the ball mill, so it is very important to control the noise of the rubber liner of the ball mill. The technology is to cover the rubber liner roller of the ball mill, and the shell of the cover is made of metal material. In order to achieve the noise reduction effect, the sound absorption material is lined inside, and the noise reduction effect can reach 1520dB. However, the method occupies a large area when used, and the equipment maintenance and repair will be relatively troublesome, and the sound insulation cover needs to be disassembled, which increases the workload of equipment maintenance and repair. The method is to use the sound absorbing material (soft) such as felt to make a curved partition, which is fastened by bolts, but the bolts are not bandaged, which is conducive to convenient maintenance. Because felt and other materials for low and intermediate frequency noise absorption ability is not strong, so the noise reduction of this method can only reach about 10dB, the noise insulation effect is not very ideal and the cost is higher than the sound insulation mask method. However, this method can facilitate equipment maintenance and repair, and does not affect the work of steel ball loading and unloading.

The method is to eliminate the rigid connection between the liner and the roller, and the noise reduction effect can reach more than 15dB after successful installation. However, this method is not easy to operate, because the elastic layer itself is a vibration system, the impact force of the steel ball hit on the liner will change with the natural frequency of the liner, resulting in greater amplitude, and only the vibration noise frequency is greater than the natural frequency of the liner will have a better effect. Therefore, if the installation is not good, it will backfire, and the cost is very high. The rubber liner is easy to install and has good damping effect. When the steel ball hits the liner, the impact duration can be increased, and the noise reduction effect can reach 20dB. However, the rubber liner price is higher and the life is shorter. The noise of rubber lining plate of ball mill is mainly impact noise caused by steel ball impact. The field energy of the outer sound field of the roller is the sum of the sound energy radiated from the shell vibration caused by a large number of steel balls striking the liner plate and the sound energy transmitted from the shell vibration caused by the shell excitation. The sound energy inside the roller is the sum of the sound energy radiated from the shell vibration caused by a large number of steel balls striking the liner plate, the sound energy caused by a large number of steel balls colliding with each other and the sound energy generated by aerodynamic noise for ore discharge. The maximum sound pressure of the rubber lining plate of the ball mill occurs at the ball excitation point. The sound field of the rubber lining cylinder of the ball mill is broadband, and the distribution of the sound field is different with different frequencies. The noise source pressure level distribution has no regularity when the frequency increases.

However, the near-field sound pressure value is high, and the sound pressure changes greatly in different directions. With the increase of the distance of the sound source, the trend weakens, and with the increase of the frequency, the sound pressure is irregular. The noise of rubber liner cylinder of ball mill is formed by continuous reflection of steel ball, liner and material bumping into each other in the cylinder. Therefore, at present, the effect of noise reduction technology such as the traditional sound insulation cover is not very good, and the noise control of the rubber liner of the ball mill must be integrated by means of sound absorption and sound insulation. The new cylinder sound insulation sleeve has good noise reduction effect, which ensures that the sound absorbing material inside has a good sound absorbing effect on the noise frequency characteristics of the rubber liner of the ball mill, and the sound insulation sleeve method is simple to install, convenient to maintain and stable to run. Performance and development of vibration absorbing cushion material and design and installation of vibration absorbing material. The damping cushion material in the cylinder is required to be able to withstand high temperature, and can continue to maintain good elasticity after enduring a certain pressure and greater impact force, and can still ensure sufficient service life.

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